Correlated interlayer exciton insulator in heterostructures of monolayer WSe2 and moiré WS2/WSe2

Zhang, Zuocheng; Regan, Emma C.; Wang, Danqing; Zhao, Wenyu; Wang, Shaoxin; Sayyad, Mohammed; Yumigeta, Kentaro; Watanabe, Kenji; Taniguchi, Takashi; Tongay, Sefaattin; Crommie, Michael; Zettl, Alex; Zaletel, Michael P.; Wang, Feng

doi:10.1038/s41567-022-01702-z

Title: Correlated interlayer exciton insulator in heterostructures of monolayer WSe₂ and moiré WS₂/WSe₂

Journal Article · Mon Aug 08 00:00:00 EDT 2022 · Nature Physics

DOI:https://doi.org/10.1038/s41567-022-01702-z· OSTI ID:1994334

^[1];

^[2]; Wang, Danqing ^[2]; Zhao, Wenyu ^[1]; Wang, Shaoxin ^[1]; Sayyad, Mohammed ^[3]; Yumigeta, Kentaro ^[3];

^[4];

^[3];

^[5];

^[5]; Zaletel, Michael P. ^[2];

^[5]

Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Materials Sciences Division
Arizona State Univ., Tempe, AZ (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Materials Sciences Division; Kavli Energy NanoScience Institute, Berkeley, CA (United States)

Moiré superlattices in van der Waals heterostructures have emerged as a powerful tool for engineering quantum phenomena. Here, in this work, we report the observation of a correlated interlayer exciton insulator in a double-layer heterostructure composed of a WSe₂ monolayer and a WS₂/WSe₂ moiré bilayer that are separated by ultrathin hexagonal boron nitride. The moiré WS₂/WSe₂ bilayer features a Mott insulator state when the density of holes is one per moiré lattice site. When electrons are added to the Mott insulator in the WS₂/WSe₂ moiré bilayer and an equal number of holes are injected into the WSe₂ monolayer, a new interlayer exciton insulator emerges with the holes in the WSe₂ monolayer and the electrons in the doped Mott insulator bound together through interlayer Coulomb interactions. The interlayer exciton insulator is stable up to a critical hole density in the WSe₂ monolayer, beyond which the interlayer exciton dissociates. Our study highlights the opportunities for realizing quantum phases in double-layer moiré systems due to the interplay between the moiré flat band and strong interlayer electron interactions.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); US Army Research Office (ARO); USDOD; National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; SC0020653; W911NF-17-1-0312; CMMI-1933214; 1935994; 1904716; DMR-1552220; DMR-1955889

OSTI ID:: 1994334

Journal Information:: Nature Physics, Vol. 18, Issue 10; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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